10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



Group description of material at hand. — Pereonites 5-7 or 6-7 

 only, coxae 3-7 or 5-7 only, second articles of pereopods 3-5 or 4-5 

 only, and pleonites 1-4 covered sparsely with fixed submarginal and 

 marginal teeth, submarginally mainly on pleon and coxae 5-6, pereo- 

 nites 1-4 always smooth except for one small posteroventral cusp 

 also found on pereonites 5-7 and forming serially a small lateral 

 carina, teeth of pereopods and pleonites increasing in number with 

 increased size of individual but also varying considerably among 

 equal-sized individuals; thus an individual 22 mm long lacking sub- 

 marginal teeth on coxae 3-4, whereas an individual 19 mm long having 

 such teeth; small individuals 9 mm or smaller with dorsal midline 

 teeth of pleonites 3-4 anteriorly reverted, becoming vertically erect 

 in larger individuals; pleonite 5 with dorsal hump, 6 with poster- 

 olateral wings; pleonal epimeron 1 with slightly convex posterior 

 margin, posteroventral corner lacking tooth, anteroventral corner with 

 one spine, epimeron 2 with small tooth and lateral ridge, epimeron 3 

 with large posteroventral tooth, a larger posteromedial tooth; rostrum 

 of medium length, weakly developed lateral planiform base of head 

 with large hemispherical ocular bulge enclosing pigmented ommatidial 

 tissue, no extraocular teeth, anteroventral margin of cheek with deep 

 notch, its boundaries forming sharp teeth, anterior tooth essentially 

 forming lateral cephalic lobe; articles 1-2 of antenna 1 moderately 

 palmate, article 3 short and simple, accessory flagellum very small, 

 1-articulate, bearing several setules, barrel-like; antenna 2 basally 

 palmate to moderate extent, article 1 with long ventral cusp appearing 

 as gland cone; epistome with appearance of fleur-de-lis; upper lip 

 rounded or nearly truncate below; mandibles broad, incisors either 

 smooth or weakly serrate, lacinia mobilis in right mandible subvermi- 

 form, distally broadened and flattened and distolaterally serrate 

 minutely and irregularly; article 1 of mandibular palp lacking con- 

 spicuous cusp, article 3 falciform; lower lip and maxillae generally as 

 in E. hodgsoni but outer lobe of maxilla 2 with 2 distolateral marginal 

 setae; emargination of telson narrower than in E. hodgsoni. 



Material.— ET 435 (female, 22 mm, figured); ET 436 (12 speci- 

 mens, some figured). 



Records.— ET 435, 63°14'S, 58°40'W, 73-92 m; ET 436, 63°14'S, 

 58°45'W, 73 m. 



Distribution. — Tierra del Fuego; Cape Virgins; Straits of Magel- 

 lan; south of Graham Land; Commonwealth Bay, 46-732 m; Mc- 

 Murdo Sound, 175-547 m; South Georgia Islands, 122-234 in; Palmer 

 Archipelago, 90-132 m; Marguerite Bay, 200 m; He Jenny, 230 in; 

 near King George Island, 73-92 m. 



Remarks. — Dana's Iphimedia nodosa would appear to be a younger 

 individual than any in this collection, the smallest at hand being 6.4 



